I like to “litter” my model battlefields with the detritus of warfare — boxes, crates, etc. Here’s a nice method for making gun crates.
Modeling
Making Sangars — Loose Rock Defensive Positions
Here’a a new word for me: Sangars. It refers to defensive positions made from loose rock. And here’s a tutorial on making the sangars.
Modeling Explosions
The cotton ball explosion marker is a staple of miniature wargaming. The Miniatures and Terrain blog has a fantastic looking version.
Modeling Wooden Road Obstacles
The Miniatures and Terrain Blog has this tutorial on modeling wooden road obstacles.